Quick answer
Usually in part. Most home insurance policies cover sudden and accidental water damage from a leaking water heater, meaning the floors, walls and contents, but not the failed tank itself, which is treated as wear and tear. Damage from a slow leak that went on for weeks is commonly excluded. Your policy wording governs, and some Ontario insurers surcharge or exclude tanks past a set age.
Home insurance covers a leaking water heater in one specific way: most policies pay for sudden and accidental water damage to the house and its contents, and do not pay for the tank that failed. The tank is wear and tear, which is the owner's cost. Your own policy wording governs, and a broker, not an HVAC contractor, is the person who can read it to you. What a contractor can tell you is what adjusters look at and how to keep the claim from happening.
The usual split: the damage is covered, the tank is not
- Typically covered: flooring, drywall, baseboards, furniture and stored belongings damaged when a tank lets go without warning, plus the drying and clean-up.
- Typically not covered: the water heater, its installation and the plumbing repair that fixes the cause.
- Often excluded: damage from a slow leak that went on for weeks or months. Insurers call it continuous or repeated seepage, and a rust trail down the jacket or rot under the pan is how an adjuster spots it.
- Depends on the policy: the deductible, any water damage sub-limit, and whether water that came up through a floor drain falls under a separate sewer backup endorsement.
The line between sudden and gradual is where claims are decided. A tank that was dry on Monday and empty on the floor on Tuesday is one story. A tank that has been weeping at the base since spring is another.
What an insurer asks after a water heater claim
Expect three questions. How old is the tank: the manufacture date is coded into the serial number on the rating plate, and the adjuster will read it. Was it maintained: a record of flushing, an anode check or a service visit helps. Was it rented or owned: with a rental, the company that owns the tank replaces it, while the damage to your house is still a matter for your own insurer and for whatever the rental agreement says about liability.
Age comes up before a claim as well. Some Ontario insurers ask the tank's age on the application or at renewal, and some surcharge, require replacement or exclude water damage from tanks past a set age. The threshold varies by company, so ask your broker what yours is. Do not understate the age, because the rating plate gets checked when there is a claim.
Loss-prevention items adjusters like to see
- A drain pan under the tank, piped to a floor drain. A pan with no drain only delays the spill.
- A leak sensor on the floor beside the tank, or an automatic shut-off valve on the cold inlet that closes when the sensor gets wet. Some insurers discount for these, so ask.
- Replacement before the 10–15 year mark. Gas tanks here commonly last 8–12 years, and less on the hard water in Halton and Hamilton if they have never been flushed.
- A relief valve discharge line that ends near the floor or over the drain, so a valve that opens does not spray the wall.
- Nothing stored against the tank, especially in a finished basement where carpet and drywall sit a metre away.
The finished basements common in 1970s–90s subdivisions are where a failed tank does the most expensive damage, because the water reaches carpet and framing before anyone goes downstairs. Signs a water heater is about to fail lists what to watch for, and whether to replace a water heater before it fails covers the timing.
What to do in the first hour of a leak
- Close the cold water valve above the tank. If it will not turn, close the main.
- Turn the gas control to off, or switch off the breaker on an electric tank.
- Photograph the tank, the rating plate, the water line on the walls and every damaged item before moving anything.
- Call your insurer or broker and ask what they need before you authorise clean-up beyond stopping the water.
- Keep the failed tank until the adjuster says it can go, and ask the installer to set it aside instead of hauling it away.
The valve-by-valve version of those steps is in how to turn off a leaking water heater.
What the uninsured part costs: repair or replacement
The tank is your bill, so it helps to know the numbers before the adjuster calls back.
- Tank-for-tank replacement, gas or electric: $1,200–$2,500 installed.
- Repair instead of replacement, where the leak is a valve or a fitting and not the tank shell: $150–$800.
- Diagnostic visit to find out which it is: $90–$150, applied to the work if you proceed.
A tank leaking from the shell cannot be repaired. A leak from the drain valve, the relief valve or a connection on top often can, and telling the two apart is the first thing a technician does.
ZK Mechanical repairs and replaces tank and tankless water heaters across Burlington, Oakville, Hamilton, Mississauga and the west GTA. Ask us to note the old tank's serial number and manufacture date on the invoice so you have them for the claim file. See water heater repair and replacement for what the work involves, or contact us to have a leaking tank looked at.